CN102047690A

CN102047690A - Speaker

Info

Publication number: CN102047690A
Application number: CN2009801190246A
Authority: CN
Inventors: 山崎英治
Original assignee: GENUS AUDIO CORP
Current assignee: GENUS AUDIO CORP
Priority date: 2008-05-21
Filing date: 2009-04-23
Publication date: 2011-05-04
Anticipated expiration: 2029-04-23
Also published as: WO2009142091A1; US8848960B2; JPWO2009142091A1; US20110085690A1; CN102047690B; JP5290284B2

Abstract

The purpose of the present invention is to reduce distortions that occur in reproduced sound when shortages of electromagnetic damping force outside the used bands of various speakers are compensated for by a mechanical damping force generated by a filling material for a vibrating plate, and further aims to improve frequency characteristics and transient characteristics. Disclosed is a cone speaker (A) that outputs audio by transmitting, to a cone (6a) shaped like a truncated cone, the movements of a voice coil driven when an audio current is transmitted through a voice coil placed inside a magnetic circuit formed in a space that surrounds a pole piece (4), wherein, inside a space between the back surface of a center cap (7) attached to a central portion of the cone (6a) and the apical surface of the pole piece (4) that faces the center cap, a first filling material (11) composed of a flexible porous body with a low porosity fills the periphery and a second filling material (12) composed of a flexible porous body with a higher porosity than the first filling material fills the central portion.

Description

Loud speaker

Technical field

The present invention relates to utilize filler to solve the improvement of the loud speaker of the distortion of reproducing sound.

Background technology

In the past, generally in cone loudspeaker, dome loud speaker or horn loudspeaker, the electromagnetic force of mainly utilizing voice coil loudspeaker voice coil to produce was braked, and tried hard to improve the transient characteristic of loud speaker.

Under the situation that such electromagnetic force of utilizing voice coil loudspeaker voice coil is braked, the shortcoming that has is: if by network or attenuator loud speaker is connected use with amplifier, then braking force can reduce under certain frequency domain, and braking is not enough, the transient characteristic deterioration.

Promptly, network will be divided into the reproduction frequency band of each loud speakers such as being suitable for tweeter, mid frequency ludspeaker from the acoustic current-meter of amplifier output, being generally-3db in the decay that is divided into the acoustic current-meter under the crossover frequency of each frequency band, is more than it outside service band.Therefore, outside service band,, utilize the braking of electromagnetic force to move owing between loud speaker and amplifier, have the bigger resistance (impedance) that decay caused of acoustic current-meter (electricity input), braking force deficiency outside service band, so transient characteristic also can deterioration.

In addition, cut apart the become one braking method of the piston vibration that moves of vibration and oscillating plate as the high frequency of hard dome, also adopt in the rear side of oscillating plate and paste bipeltate etc., or put into soft sound-absorbing material in the space of the rear side of oscillating plate and contact with oscillating plate, make its method, but be not very effective improving aspect frequency characteristic and the transient characteristic as brake drag action.

For addressing the above problem, the inventor has disclosed a kind of loud speaker in following patent documentation 1, this loud speaker is near the position of oscillating plate and oscillating plate almost parallel and between support of establishing and the oscillating plate or between equalizer and oscillating plate, be provided with the acoustic resistor that is made of soft porous material.

In this loud speaker, the braking force deficiency of loud speaker, particularly the deterioration of the transient characteristic that caused of the electromagnetic force deficiency that produces outside service band of the loud speaker that uses of network improves, and, can significantly improve frequency characteristic and transient characteristic by producing for the become one sound equipment braking force of the piston vibration that moves of oscillating plate.

Yet, the problem that this loud speaker exists is: owing to be provided with the acoustic resistor that is made of soft porous material between oscillating plate and support or equalizer, therefore in order to obtain effective braking force, must make support etc. quite little with the distance of oscillating plate, therefore big if the displacement of oscillating plate becomes, then soft porous material can be oppressed and the density increase, because the variation of its thickness, the acoustic resistance value can change, and reproduces sound and can produce distortion.

Therefore, the inventor has disclosed a kind of loud speaker of improvement in following patent documentation 2, and this loud speaker constitutes the multi-ply construction of above-mentioned acoustic resistor by soft porous material and hard porous material.

The acoustic resistor of such multi-ply construction, because even soft porous material is oppressed and under the situation that density increases when the displacement of oscillating plate is big, also can carry out the circulation of air by hard porous material, therefore irrelevant with the size of the displacement of oscillating plate, can obtain all the time roughly certain acoustic resistance power, porous material carries out good tracking to the vibration of oscillating plate, improves frequency characteristic and transient characteristic.

The loud speaker that the patent documentation 2 of improvement is as mentioned above disclosed after the inventor has carried out inquiring into repeatedly, found that reproducing sound at work can produce distortion, brings adverse effect to frequency characteristic etc.

Promptly, in the loud speaker that patent documentation 2 discloses,, therefore can circulate well by hard porous material air at periphery because soft porous material and hard porous material are that stratiform is overlapping, but be difficult to circulate at the central portion air, reproduce likeness of the deceased and easily produce distortion.

Patent documentation 1: the special fair 03-059639 communique of Japan

Patent documentation 2: Japanese kokai publication hei 01-320900 communique

Summary of the invention

The present invention finishes for addressing the above problem, its purpose is, when compensating the outer electromagnetic system power of service band not enough, try hard to reduce the distortion of reproducing sound, improve frequency characteristic and transient characteristic by the mechanical braking power that filler caused for oscillating plate.

Above-mentioned purpose is can be as being issued under the situation of cone loudspeaker: be installed in the space between the front end face of the back back side of center cap of central part of taper and the newel (pole piece) relative with it, fill first filler that constitutes by the lower soft porous body of voidage at periphery, fill by voidage at central part and be higher than second filler that the soft porous body of first filler constitutes.

In addition, can be under the situation of dome loud speaker: in the space between the front end face of the back back side of cheese oscillating plate and the newel relative with it as being issued to, fill first filler that constitutes by the lower soft porous body of voidage at periphery, fill by voidage at central part and be higher than second filler that the soft porous body of first filler constitutes.

In addition, have towards can be under the situation of the horn loudspeaker of the oscillating plate of the convex in the place ahead: in the space between the front end face of the back back side of oscillating plate and the newel relative with it as being issued to, fill first filler that constitutes by the lower soft porous body of voidage at periphery, fill by voidage at central part and be higher than second filler that the soft porous body of first filler constitutes.

In addition, in that have under the situation of the horn loudspeaker of the oscillating plate of the convex at rear can be as being issued to: back cover plate is installed across set gap in the behind at oscillating plate, in the space between the inner surface of the back back side of above-mentioned oscillating plate and back cover plate, fill first filler that constitutes by the lower soft porous body of voidage at periphery, fill by voidage at central part and be higher than second filler that the soft porous body of first filler constitutes.

Preferably, it is higher near near the central shaft of the peristome that communicates with extraneous gas that above-mentioned first filler and second filler all constitute its voidage, and voidage is along with leaving from central shaft and reducing.

In addition, usually preferably, above-mentioned second filler is filled to cylindric, and is set as its front and is contained in above-mentioned first filler, and rear end side is opened to extraneous gas in the rear side of loud speaker.

Preferably, at least one side of above-mentioned first filler and second filler is made of fiber or synthetic resin foaming body.

In the present invention, as mentioned above, by filling in the space between the front end face of the back back side of oscillating plate etc. and newel by contact with both and first filler of the soft porous body formation of voidage lower (being that air flow resistance is higher), and approximate centre axle along this first filler, with the first filler state of contact under, filling is by second filler of voidage height (being that air flow resistance is low) in the soft porous body formation of first filler, the circulation of air that can prevent such in the past central part at first filler is relatively poor, the reproduction sound that causes with the variable density of the filler that vibration caused of oscillating plate produces distortion, in view of the above, can try hard to improve frequency characteristic and transient characteristic.

Description of drawings

Fig. 1 is the cutaway view along the central shaft of an embodiment of cone loudspeaker involved in the present invention.

Fig. 2 is the cutaway view along the central shaft of an embodiment of dome loud speaker involved in the present invention.

Fig. 3 is the cutaway view along the central shaft of an embodiment of horn loudspeaker involved in the present invention,

Fig. 4 is the cutaway view along the central shaft of another embodiment of horn loudspeaker involved in the present invention.

Description of reference numerals

The A cone loudspeaker; 1 magnet; 2 top boards; 3 backboards; 4 newels; 5 voice coil loudspeaker voice coils; The 6a cone; The 6b edge part; 7 center caps; 8 vibration absorbers; 9 frameworks; 10 liners; 11 first fillers that constitute by the lower soft porous body of voidage; 12 second fillers that constitute by the higher soft porous body of voidage; B dome loud speaker; The 13a oscillating plate; The 13b edge part; 14 equalizers; The C1 horn loudspeaker; The 15a oscillating plate; The 15b edge part; 16 equalizers; 17 Road narrows (throat); 18 loudspeaker; The C2 horn loudspeaker; The 19a oscillating plate; The 19b edge part; 20 back cover plates.

Embodiment

Below, with reference to embodiment shown in the drawings, the mode that is used to implement the best of the present invention is described.

Fig. 1 is the cutaway view along the central shaft of an embodiment of cone loudspeaker involved in the present invention; Fig. 2 is the cutaway view along the central shaft of an embodiment of dome loud speaker involved in the present invention; Fig. 3 is the cutaway view along the central shaft of an embodiment of horn loudspeaker involved in the present invention; Fig. 4 is the cutaway view along the central shaft of another embodiment of horn loudspeaker involved in the present invention.

At first, embodiment shown in Figure 1 is described.

Among Fig. 1, A is a cone loudspeaker involved in the present invention, the 1st, and magnet, the 2nd, top board, the 3rd, backboard, the 4th, newel utilizes these to form magnetic circuit.

The 5th, voice coil loudspeaker voice coil, 6a is a cone, 6b is its edge part, voice coil loudspeaker voice coil 5 be configured in the centre bore of top board 2 of annular coaxial and establish newel 4 around the space in magnetic circuit in, by passing through acoustic current-meter at this voice coil loudspeaker voice coil 5, voice coil loudspeaker voice coil carries out the vibration corresponding with acoustic current-meter, and the Motion Transmission of this voice coil loudspeaker voice coil is carried out voice output to the cone 6a of truncated cone shape.

7 are mounted in the center cap of central part of the cone 6a of above-mentioned truncated cone shape, and the 8th, vibration absorber, the 9th, be used for fixing the framework of the edge part 6b of cone 6a, the 10th, liner.

In above-mentioned cone loudspeaker A involved in the present invention, in the space between the front end face of the back back side of center cap 7 and newel 4, at first filler 11 of periphery filling, fill by second filler 12 of voidage height (being that air flow resistance is low) in the soft porous body formation of first filler at central part by the soft porous body formation of voidage lower (being that air flow resistance is higher).

Promptly, in the space between the front end face of the back back side of above-mentioned dome-shaped oscillating plate 13a and newel 4, first filler 11 that filling is made of the lower soft porous body of voidage, and approximate centre axle along this first filler, with the first filler state of contact under, fill by voidage and be higher than second filler 12 that the soft porous body of first filler constitutes.

Make up as mentioned above by filler voidage difference (air flow resistance difference), be filled into the back back side of center cap 7 and be in contact with it, can prevent that reproduction sound relatively poor in the circulation of the air of the central part of first filler 11, that cause with the variable density of the filler that vibration caused of oscillating plate from producing distortion, in view of the above, can try hard to improve frequency characteristic and transient characteristic.

That is, for example if only fill filler 11 at the whole back part of center cap 7, then with vibration center cap 7 vibrations accordingly of voice coil loudspeaker voice coil 5 time, the density of the filler 11 of filling can change (air flow resistance can change), and braking force can be affected, and reproducing sound can distortion.

Be anti-phenomenon here, in the present invention, fill voidage height (air flow resistance is low) in second filler 12 of filler 11, perhaps make this part keep empty shape at the central part of filler 11.

Can do following understanding by preventing the distortion of reproducing sound like this: if will be only by density first filler 11 of big (air flow resistance is higher) fill the situation in whole space of the back part of center cap 7, with do not fill second filler 12 among Fig. 1 fully and make this part be empty space, and the situation that first filler 11 only is filled in place shown in Figure 1 compared, then under the former situation, the passage that air passes is limited to the area of opening port, and the influence of the variable density that vibration caused of oscillating plate is bigger; And under the latter's situation (do not fill second filler 12 fully, this part is empty space, and first filler 11 only is filled in situation about locating as shown in Figure 1), because opening surface is expanded to cylinder sides from circle, therefore air pass well, stream shortens, obviously the distortion meeting reduces.

As mentioned above, in order to reduce the distortion of reproducing sound, preferably first filler 11 is more from leaving with center cap 7 contact positions, the air flow resistance of filler inside is few more, therefore, preferably the voidage of the filler of Tian Chonging is higher near central shaft, and voidage is along with leaving from central shaft and reducing.

Distribution adjustment for such air flow resistance of carrying out filler inside, as shown in the figure, second preferably that voidage is the higher filler 12 is filled to cylindric, and be set as its front is contained in the first lower filler 11 of voidage, and rear end side is opened to extraneous gas in the rear side of loud speaker.

As the concrete raw material of filler, preferably adopt fiber or synthetic resin foaming body.

Next, embodiment shown in Figure 2 is described.

Among Fig. 2, B is a dome loud speaker involved in the present invention, among this figure, owing to represent the inscape identical with the parts of Fig. 1 with the parts that Fig. 1 marks same reference encoder, therefore omits it and specifies.

Have, among Fig. 2,13a is dome-shaped oscillating plate (diaphragm) again, and 13b is its edge part, the 14th, and equalizer.

In this embodiment, in the space between the front end face of the back back side of above-mentioned dome-shaped oscillating plate 13a and newel 4, fill first filler 11 that constitutes by the lower soft porous body of voidage at periphery, fill by voidage at central part and be higher than second filler 12 that the soft porous body of first filler constitutes.

Promptly, in the space between the front end face of the back back side of dome-shaped oscillating plate 13a and newel 4, first filler 11 that filling is made of the lower soft porous body of voidage, and approximate centre axle along this first filler, with the first filler state of contact under, fill by voidage and be higher than second filler 12 that the soft porous body of first filler constitutes.

Identical with the situation of the embodiment of Fig. 1, preferably second filler 12 is filled to cylindricly, its front is contained in above-mentioned first filler 11, and rear end side is opened to extraneous gas in the rear side of loud speaker.

Like this, make up as mentioned above by the filler that voidage is different, be filled into the back back side of oscillating plate 13a and be in contact with it, identical during with the embodiment of Fig. 1, can prevent to cause that reproducing sound produces distortion in that the circulation of the air of the central part of first filler 11 is relatively poor, in view of the above, can try hard to improve frequency characteristic and transient characteristic.

Next, embodiment shown in Figure 3 is described.

Among Fig. 3, C1 is a horn loudspeaker involved in the present invention, among this figure, the parts that mark same reference encoder with Fig. 1 are represented the inscape identical with the parts of Fig. 1, have again, among Fig. 3,15a is towards the oscillating plate of the place ahead convex (diaphragm), and 15b is its edge part, the 16th, and equalizer, the 17th, Road narrows, the 18th, loudspeaker.

In this embodiment, in the space between the front end face of the back back side of above-mentioned oscillating plate 15a towards the place ahead convex, newel 4, fill first filler 11 that constitutes by the lower soft porous body of voidage at periphery, fill by voidage at central part and be higher than second filler 12 that the soft porous body of first filler constitutes.

Promptly, in the space between the front end face of the back back side of the oscillating plate 15a of the place ahead convex and newel 4, first filler 11 that filling is made of the lower soft porous body of voidage, and approximate centre axle along this first filler, with the first filler state of contact under, fill by voidage and be higher than second filler 12 that the soft porous body of first filler constitutes.

Like this, make up as mentioned above by the filler that voidage is different, be filled into the back back side of oscillating plate 15a and be in contact with it, identical during with the embodiment of Fig. 1, can prevent to cause that reproducing sound produces distortion in that the circulation of the air of the central part of first filler 11 is relatively poor, in view of the above, can try hard to improve frequency characteristic and transient characteristic.

Next, embodiment shown in Figure 4 is described.

Among Fig. 4, C2 is a horn loudspeaker involved in the present invention, among this figure, the parts that mark same reference encoder with Fig. 1 and Fig. 3 are represented the inscape identical with the parts of Fig. 1 and Fig. 3, have, among Fig. 4 again, 19a is the oscillating plate towards the rear convex, the 20th, and back cover plate.

In this embodiment, in the space between the inner surface of the back back side of above-mentioned oscillating plate 19a towards the rear convex and back cover plate 20, fill first filler 11 that constitutes by the lower soft porous body of voidage at periphery, fill by voidage at central part and be higher than second filler 12 that the soft porous body of first filler constitutes.

Promptly, in the space between the inner surface of the back back side of the oscillating plate 19a of rear convex, back cover plate 20, first filler 11 that filling is made of the lower soft porous body of voidage, and approximate centre axle along this first filler, with the first filler state of contact under, fill by voidage and be higher than second filler 12 that the soft porous body of first filler constitutes.

Like this, make up as mentioned above by the filler that voidage is different, be filled into the back back side of oscillating plate 19a and be in contact with it, identical during with the embodiment of Fig. 1, can prevent to cause that reproducing sound produces distortion in that the circulation of the air of the central part of first filler 11 is relatively poor, in view of the above, can try hard to improve frequency characteristic and transient characteristic.

In addition, the invention is not restricted to the foregoing description, in this purpose scope, comprising the practitioner can expect all variant embodiment easily from above-mentioned explanation.

Utilize possibility on the industry

As mentioned above, adopting when of the present invention, can prevent from causing that reproducing sound produces distortion in that the circulation of the air of the central part of filler is relatively poor, accordingly, can try hard to improve frequency characteristic and the transient characteristic of the loudspeaker of various forms, so the present invention industrially has huge value.

Claims

1. a cone loudspeaker (A), by making acoustic current-meter drive voice coil loudspeaker voice coil,, carry out voice output with the Motion Transmission of driven voice coil loudspeaker voice coil cone (6a) to the truncated cone shape by the voice coil loudspeaker voice coil (5) that is placed in the magnetic circuit that forms around the space of newel (4), it is characterized in that

In the space between the front end face of the back back side of the center cap (7) of the central part that is installed in taper (6a) and the newel (4) relative with it, fill first filler (11) that constitutes by the lower soft porous body of voidage at periphery, fill by voidage at central part and be higher than second filler (12) that the soft porous body of first filler constitutes.

2. a dome loud speaker (B), by making acoustic current-meter drive voice coil loudspeaker voice coil, the Motion Transmission of driven voice coil loudspeaker voice coil to the cheese oscillating plate (13a) of convex forwards, is carried out voice output by the voice coil loudspeaker voice coil (5) that is placed in the magnetic circuit that forms around the space of newel (4), it is characterized in that

In the space between the front end face of the back back side of described cheese oscillating plate (13a), the newel (4) relative with it, fill first filler (11) that constitutes by the lower soft porous body of voidage at periphery, fill by voidage at central part and be higher than second filler (12) that the soft porous body of first filler constitutes.

3. a horn loudspeaker (C1), by making acoustic current-meter drive voice coil loudspeaker voice coil by being placed at the interior voice coil loudspeaker voice coil (5) of magnetic circuit that forms around the space of newel (4), with the Motion Transmission of driven voice coil loudspeaker voice coil to the oscillating plate of convex (15a) forwards, carry out voice output, the loudspeaker (18) in the place ahead by being located at oscillating plate (15a) carry out public address, it is characterized in that

In the space between the front end face of the back back side of the oscillating plate (15a) of described convex forwards and the newel (4) relative with it, fill first filler (11) that constitutes by the lower soft porous body of voidage at periphery, fill by voidage at central part and be higher than second filler (12) that the soft porous body of first filler constitutes.

4. a horn loudspeaker (C2), by making acoustic current-meter drive voice coil loudspeaker voice coil by being placed at the interior voice coil loudspeaker voice coil (5) of magnetic circuit that forms around the space of newel (4), with the Motion Transmission of driven voice coil loudspeaker voice coil to the oscillating plate of convex (19a) rearward, carry out voice output, the loudspeaker (18) in the place ahead by being located at oscillating plate (19a) carry out public address, it is characterized in that

Back cover plate (20) is installed across set gap in behind at the oscillating plate (19a) of described convex rearward, in the space between the inner surface of the back back side of described oscillating plate (19a) and back cover plate (20), fill first filler (11) that constitutes by the lower soft porous body of voidage at periphery, fill by voidage at central part and be higher than second filler (12) that the soft porous body of first filler constitutes.

5. according to each described loud speaker in the claim 1 to 4, it is characterized in that it is higher near central shaft that described first filler (11) and second filler (12) all constitute its voidage, and voidage is along with leaving from central shaft and reducing.

6. according to each described loud speaker in the claim 1 to 4, it is characterized in that, described second filler (12) is filled to cylindric, and is set as its front and is contained in described first filler (11), and rear end side is opened to extraneous gas in the rear side of loud speaker.

7. according to each described loud speaker in the claim 1 to 6, it is characterized in that at least one side of described first filler (11) and second filler (12) is made of fiber.

8. according to each described loud speaker in the claim 1 to 6, it is characterized in that at least one side of described first filler (11) and second filler (12) is made of the synthetic resin foaming body.